Anatomy
Origin:
Lateral epicondyle of humerus via the common extensor tendon, adjacent intermuscular septum.
Insertion:
Dorsal hood of the little finger.
Key Relations:
One of the two muscles in the intermediate posterior compartment of the forearm.
Functions
-Extends the little finger at the metacarpophalangeal joint.
-Extends the interphalangeal joints of the little finger.
-Helps extend hand at wrist.
Supply
Nerve Supply:
Posterior interosseous nerve (C7,C8) (continuation of deep branch of the radial nerve).
Blood Supply:
Posterior interosseous artery.
Clinical
The little finger is extended by the action of two muscles extensor digitorum and extensor digiti minimi. Due to these dual extensors the tendon of extensor digiti minimi may be used for tendon transfer procedures (such as restoring opposition of the thumb) while still allowing extension of the index finger.
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